Carbon credits certify the removal of greenhouse gas from the air or the prevention of greenhouse gas emissions. Each carbon credit is associated with a single tonne of carbon dioxide. There are many different kinds of carbon credits.
For individuals:
There are many retailers offering uncertified carbon offsets. Purchasers should avoid carbon offsets that don't come with a certification as they provide no guarantees that you are getting what you are paying for.
There are many different kinds of certification available globally. Before you buy, make sure that the certification comes from a trusted third party source.
For larger orders Carbon Planet can source any kind of certified carbon credit you seek.
The New South Wales Greenhouse Abatement Certificate (NGAC) certification process is comprehensive. It includes Kyoto Protocol measures, but goes beyond these. In summary the NGAC certification process ensures the following:
(From NSW Government "When can a forest manager create NGACs" NSW Greenhouse Gas Abatement Scheme Fact Sheet Published: October 2004).
Forests NSW's carbon pool is audited annually to ensure that every carbon credit issued corresponds to one tonne of carbon dioxide removed from the atmosphere for 100 years.
By purchasing a monthly subscription of NGAC carbon credits, you can continuously erase your CO2 footprints.